A former McLean teacher has been charged with sexually assaulting four students in the late 1960s.

County police said Friday that following a year-long investigation, detectives charged a 73-year-old McLean man with three counts of indecent liberties and one of abduction with intent to defile involving four of his former students, who are today all in their fifties.

Christopher R. Kloman, of Julie Avenue, taught at the Potomac School in McLean from 1965 until 1994.

He was working as a substitute teacher at the Washington Episcopal School in Bethesda, Maryland until the investigation began, police said.

Kloman was arrested and charged at 1 p.m. on Friday, and was transported to the Fairfax County Adult Detention Center, where he is being held without bond.There is no attorney information yet available.

Police said the investigation began when police received a report in November 2011 from a 57-year-old woman who reported that she was molested by Kloman as a 12-year-old girl.

The woman said that Kloman had been one of her elementary school teachers. She reported the incident to the Washington Episcopal School, where she recently ran into him and saw that he was still teaching children.

Police said that the investigation revealed additional victims; all girls who were between the ages of 12 and 14 when the alleged offenses occurred in 1968 and 1969.

Police said there may be additional victims. Anyone with information is asked to contact Fairfax County Police at 703-691-2131.